ASICS Men's GT-2140 Trail Running Shoe 100% Synthetic and mesh Rubber sole Impact Guidance System (I.G.S.) enhances the foot's natural gait from heel strike to toe-off Space Trusstic System creates a pocket between the Trusstic System device and the midsole, allowing for greater midsole deformation and more efficient foot function Solyte midsole material is lighter than ASICS' standard EVA and SpEVA, combined with improved cushioning and durability Performance trail upper is water resistant and very breathable, gusset construction prevents debris from entering the shoe and causing irritation